#include<stdio.h>
#include<string.h>
char separatori[]=" !#$%&'()*+,-./:;<=>?@[]^_`~{}";
char s[100000],*p;
int lg,nr;
int main()
{
freopen("text.in","r",stdin);
freopen("text.out","w",stdout);
gets(s);
p=s;
p=strtok(p,separatori);

while(p)
	{
	 lg+=strlen(p);
	 nr++;
	 p=strtok(NULL,separatori);
	}
printf("%d",lg/nr);
return 0;
}